This tool works with the Clamp rings and Barbed PEX fittings to make PEX Connections. Click the metal tabs up to make secure connections for 3/8ths to 1 inch pex clamps, fittings and tubing.

If needed, you can also click the tabs down to use the cutter to remove fittings and remake connections.

http://www.supplyhouse.com/Bluefin-PXCLTL-Heavy-Duty-PEX-Ratchet-Clamp-Cutting-Tool